Mizuki, a new female teacher at the part-time high school, entices a married senior teacher into an affair. Despite being younger, Mizuki adopts an attitude that belittles her older students, earning her resentment from everyone. Amidst this, her affair is discovered by a physical education teacher, who threatens to expose it to the school and forces himself on her. This incident is also secretly filmed by a perverted teacher who is her peer and harbors feelings for Mizuki. Together with students who bear a grudge against Mizuki, they summon her to confront her...
